Re: Home network using 192.162.1.x IP range

[Tom Jedrzejewicz <tomjedrz@xxxxxxxxxxxxxx>]

In a nutshell ... the IP addresses defined as private will not be
transferred on the public internet.  It is enforced, like everything else
on the internet, by convention.

It doesn't really matter what you do behind your firewall. The only
technical problem caused by using a public IP assigned to someone else is
that you won't be able to communicate with the legitimate holder of that
IP.  In this case, that is not likely to be a problem.
.

On Tue, Jul 14, 2015 at 12:54 PM Dan <dan27649@xxxxxxxxx> wrote:

> Helping out a friend today, I noticed his home network is using the
> 192.162.x.x IP range.  (The router's address is 192.162.1.0.)
>
> I understand that IANA RFC 1918 spec defined a few blocks of IP addresses
> that could be used for private networks, including 192.168.nnn.nnn.
>
> But I'm not clear on what the implications are of using of 192.162.x.x for
> a home network. THE BIG QUESTION: Is he any more vulnerable to attack for
> using 192.162.nnn.nnn than 192.168.nnn.nnn?
>
> Diving deeper:
> From the spec, it appears that one can use *any* IP block. Per the
> statement, "[A]ny enterprise that needs globally unique address space is
> required to obtain such addresses from an Internet registry."  From that, I
> infer my friend's use of 192.162.x.x does not expose him to attacks.
>
> I note from the RFC:
> [Non-private] hosts will be public and will use globally unique address
> space assigned by an Internet Registry. Public hosts can communicate with
> other hosts inside the enterprise both public and private and can have IP
> connectivity to public hosts outside the enterprise. Public hosts do not
> have connectivity to private hosts of other enterprises.
>
> Trying to understand the context of the last statement.  Who/what
> "enforces" this statement?
>
> - Dan
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